_N.B_.—Several of the figures in these seven Heliotype Plates have been reproduced from photographs, instead of from the original negatives; and they are in consequence somewhat indistinct. Nevertheless they are faithful copies, and are much superior for my purpose to any drawing, however carefully executed. CHAP. I—GENERAL PRINCIPLES OF EXPRESSION. The three chief principles stated—The first principle—Serviceable actions become habitual in association with certain states of the mind, and are performed whether or not of service in each particular case—The force of habit—Inheritance—Associated habitual movements in man—Reflex actions—Passage of habits into reflex actions—Associated habitual …
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